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Data entities that are independently stored

<h2>Package Specification</h2>

<ul>
<li>ShortFloats: BudgetValue (priority/durability/quality) and TruthValue (frequency/confidence)</li>
<li>Base: serial numbers associated to TruthVallue</li>
<li>Sentence: a Term, a TruthValue, and a Base. A Sentence can be a Judgment, a Goal, or a Question.</li>
<li>Task: a Sentence to be processed.</li>
<li>TermLink: built in pair between a compound term and a component term.</li>
<li>TaskLink: special TermLink refering to a Task, whose Term equals or directly contains the current Term.</li>
<li>Concept: labeled by a Term, contains a TaskLink bag and a TermLink bag for indirect tasks/beliefs, as well as beliefs/questions/goals directly on the Term.</li>
<li>Item: Concept, Task, or TermLink</li>
</ul>    

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